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1 Although combustion system improvements allow extremely low level of particulate (EURO 4 particulate level is already achieved) the particulate filter appears to be the only solution to reduce solid particulate emission by two to three order of magnitude over the whole size range starting from 10 nm. This is the reason why an active particulate filter system has been developed. The major issue was to fill in the gap between particulate regeneration temperature (550°C) and the naturally low exhaust gas temperature of modern DI diesel engine (150°C to 200°C in city driving conditions). This low exhaust gas temperature is the result of overall efficiency improvement to reduce fuel consumption.